Journal ArticleDOI
Effects of Liquid-phase Electrical Conductivity, Water Content, and Surface Conductivity on Bulk Soil Electrical Conductivity
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In this paper, the authors used a simple capillary model, which assumes that liquid phase and surface conductivities (via exchangeable cations) behave as resistors in parallel, and calculated the values of ECa for each ECw equilibration from measured four-electrode resistances and an appropriate cell constant.Abstract:
Recent research has demonstrated that field soil salinity can be inferred from four-electrode soil electrical conductivity (ECa), if the soil profile is near "field capacity" and calibration curves, based on saturation extract salinity (ECe), are available. To extend the use of this field method to arbitrary water contents, we studied EC in the laboratory as a function of water content and in situ soil water conductivity (ECw). We collected undisturbed cores of four soil types (fsl, vfsl, 1, cl) using Lucite column inserts, which were tapped for later insertion of electrodes. The cells were equilibrated with waters of a desired EC,r and, using a pressure membrane apparatus, adjusted to a desired Values of ECa were calculated for each ECW equilibration from measured four-electrode resistances and an appropriate cell constant. Our results indicated that over the -range of practical concern, ECa = (transmission coefficient) x x ECw + surface conductivity. This relationship is derived using a simple capillary model, which assumes that liquid phase and surface conductivities (via exchangeable cations) behave as resistors in parallel. Additional Index Words: soil electrical conductivity, soil salinity, surface conductance. View complete article To view this complete article, insert Disc 3 then click button8read more
Citations
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Journal ArticleDOI
Electrical resistivity survey in soil science: a review .
TL;DR: In this paper, the authors overview the variation of electrical resistivity as a function of soil properties, and the main electrical device to performed one-, two-or three-dimensional surveys, and explain the basic principles of the data interpretation.
Journal ArticleDOI
Soil Moisture Measurement for Ecological and Hydrological Watershed-Scale Observatories: A Review
David A. Robinson,Colin S. Campbell,Jan W. Hopmans,Brian K. Hornbuckle,Scott B. Jones,Rosemary Knight,Fred L. Ogden,John S. Selker,Ole Wendroth +8 more
TL;DR: In this article, the authors review advances in sensor technology, particularly emerging geophysical methods and distributed sensors, aimed at bridging this gap and offer a vision for future research, listing many of the current scientific and technical challenges.
Journal ArticleDOI
Apparent soil electrical conductivity measurements in agriculture
Dennis L. Corwin,Scott M. Lesch +1 more
TL;DR: The field-scale application of apparent soil electrical conductivity (EC"a) to agriculture has its origin in the measurement of soil salinity, which is an arid-zone problem associated with irrigated agricultural land and with areas having shallow water tables as mentioned in this paper.
Journal ArticleDOI
Soil properties influencing apparent electrical conductivity: a review
TL;DR: The most common method for in situ assessment of soil salinity is to measure the apparent electrical conductivity (EC) and volumetric water content (Q) of the soil and apply measured or predicted EC"a(EC"w,@q) calibration curves as mentioned in this paper.
Journal ArticleDOI
Measurement of soil water content and electrical conductivity by time domain reflectometry: a review
TL;DR: An overview of theoretical background for measuring water content and electrical conductivity is presented as well as characteristics of different types of probes in this article, and limitations of applying TDR techniques to measuring soil water and salinity are also addressed.
References
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Journal ArticleDOI
Chloride diffusion in soils as influenced by moisture content.
Journal ArticleDOI
Determining Salinity in Field Soils with Soil Resistance Measurements1
J. D. Rhoades,R. D. Ingvalson +1 more
Journal ArticleDOI
Influence of water content on electrical conductivity of the soil
S. C. Gupta,R. J. Hanks +1 more
TL;DR: In this article, a model for measuring dynamical SALINITY and water content in a system where rippling water movements are assumed to have occurred in a four-probe setup was presented.
Journal ArticleDOI
Establishing Soil Electrical Conductivity-Salinity Calibrations Using Four-Electrode Cells Containing Undisturbed Soil Cores
TL;DR: In this article, a simpler and more accurate method than previously used methods for calibrating soil salinity against soil electrical conductivity (ECa) is presented, and results are given which show that these calibrations are applicable to the Wenner array method of field ECa determinations.